AI 173 then QF 3748 at San Francisco
New Delhi → San Francisco → San Diego
Timetable, San Francisco time
07:00AI 173 from New Delhi at the gate
20:00QF 3748 to San Diego leaves the gate
13 h apart on the timetable
QF 3748 leaves 13 h after AI 173 arrives on the timetable: more than half a day, so not a connection we count.